-LRB- CNN -RRB- -- It 's a horror show that has played out across Syria for 19 months . Those grieving the dead are themselves targeted by gunfire or deadly blasts .

That cycle of death played out again Tuesday when mourners gathered to grieve a man who dared speak out against the Syrian government .

A car bomb silenced them .

`` Children 's bodies were maimed and burnt . I saw pieces of human flesh and blood on the street , '' witness Ahmed Al-Muadami said .

This day , mourners came to honor one of 14 men who died after his arrest by Air Force Intelligence -- a much feared security apparatus that dissidents accuse of hunting down anti-government activists .

Word spread quickly Tuesday that a Damascus hospital had a collection of unidentified bodies .

The families of the 14 men rushed to the scene -- only to discover the bodies of their loved ones bore signs of torture .

The outrage boiled over in the Damascus suburb of Muadamiyet al-Sham , where a funeral procession for one of the men morphed into a protest against President Bashar al-Assad 's government .

Then came the explosion near the Al-Zaitoona mosque , which is a popular gathering site for anti-government protests .

`` It was a car bomb parked next to the mosque where the people were gathered . The explosion killed at least 13 people and wounded over a hundred , '' Al-Muadami said .

`` One child was extremely disfigured ... we could n't identify him . ''

Amateur videos reportedly from the scene show a grisly aftermath .

One man carried the lifeless body of a child , his face charred black and gray .

`` Look at this , Assad ! '' the man screamed . `` Is this your gift to us for the Eid ? Look at this , you murderer ! ''

The Muslim holiday of Eid al-Adha begins Friday .

CNN can not independently verify the authenticity of the videos or reports of violence , as the Syrian government has restricted access to international journalists .

The Damascus suburbs have seen fierce fighting for months . Opposition activists say the government has committed massacres , while the government says it is fighting armed terrorists .

International envoy Lakhdar Brahimi is trying to broker a cease-fire by Friday .

But the odds seem daunting .

On Tuesday alone , at least 100 people were killed in Damascus and its suburbs ; 50 were from Muadamiyet al-Sham , the opposition Local Coordination Committees of Syria said .

The activist network said residents in the town called for blood donors after the explosion .

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13 people are killed in an explosion at a funeral of an opposition activist

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`` Look at this , Assad ! ... Look at this , you murderer ! '' one man screams

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The blast takes place in the Damascus suburbs , which has seen months of fighting

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International envoy Lakhdar Brahimi is trying to broker a cease-fire by Friday